Pinterest Forum

The site's popularity has exploded in recent months, making it one of the fastest-growing websites in history. Its ascent to 10 million monthly visitors happened faster than Facebook, Twitter or any other site tracked by comScore.

Pinterest's creators registered Pinterest.com in 2009, but it didn't take off until last summer. ComScore says the site had 17.8 million U.S. visitors last month, up about 50 percent from 11.7 million in January and nearly four times the 4.9 million in November. ComScore analyst Andrew Lipsman says he has not seen an independent website reach 10 million visitors faster than Pinterest.

Of course their rise to fame is accredited to being linked to Facebook, big surprise, so they're kind of getting the same boost Zynga got, but this is way bigger than Farmville ever was!